re PR c++/37006 (explicitly deleted inline function gives warning "used but never defined")

        PR c++/37006
        * pt.c (tsubst_decl): Leave DECL_INITIAL set on deleted
        instantiations.

From-SVN: r138648

gcc/cp/ChangeLog

+2008-08-04  Jason Merrill  <jason@redhat.com>
+
+	PR c++/37006
+	* pt.c (tsubst_decl): Leave DECL_INITIAL set on deleted
+	instantiations.
+
 2008-08-04  Simon Baldwin  <simonb@google.com>
 
 	PR c++/36999

gcc/cp/pt.c

@@ -8143,7 +8143,9 @@ tsubst_decl (tree t, tree args, tsubst_flags_t complain)
 	/* Clear out the mangled name and RTL for the instantiation.  */
 	SET_DECL_ASSEMBLER_NAME (r, NULL_TREE);
 	SET_DECL_RTL (r, NULL_RTX);
-	DECL_INITIAL (r) = NULL_TREE;
+	/* Leave DECL_INITIAL set on deleted instantiations.  */
+	if (!DECL_DELETED_FN (r))
+	  DECL_INITIAL (r) = NULL_TREE;
 	DECL_CONTEXT (r) = ctx;
 
 	if (member && DECL_CONV_FN_P (r))

gcc/testsuite/g++.dg/cpp0x/defaulted3.C

+// PR c++/37006
+// { dg-options "-std=c++0x" }
+
+template<class T>
+struct A {
+  template<class U>
+  bool operator==(const A<U>&) = delete; // { dg-error "deleted function" }
+  operator bool () { return true; }
+};
+
+int main()
+{
+  A<int> a1;
+  A<void> a2;
+  if(a1 == a2) {}		// { dg-error "used here" }
+}